Submersible boat



April 19, 1932. Y. KINOSHITA I SUBMERSIBLE BOAT Filed Marqh 51.1931 2 Sheets-Sheet 1 Patented Apr. 19, 1932 UNITED STATES" PATENT OFFICE YA S' UJ'IRO KINOSHITA, OF KOISHIKJAWA-KU, TOKYO, JAPAN V SUBMERSIBLE BOAT Application filed March 31, 1931, Serial No. 526,608, and in Japan April 25, 1930.

This invention relates to a submersible boat which travels through the waves in a partially submerged condition. The objects of the invention, among others, are as follows Firstly, the body of the boat is made long and narrow in shape which, combined with its sharp edged fore and aft ends offers a minimum resistance of water while the total of the weight of the boat and its contents being made a little less than its buoyancy it is always kept in a partially submerged condition so that it is not affected by the rough actions of the wind and waves that it is to.

encounter on its high speed passage. The boat consists of a number of sections joined together in a straight line in such a way that it is made bendable horizontally at the junction where two ends of the sections meet,

thus aiding to preserve its'stability. and to travel at high speed.

Secondly, "on both sides of the jointing part of each section isfixed a stop plate extending overothe end of the successive section, forming a shape of a pair of opened scissors, by means of which the turning angle atjthe junction is restricted within a certain limit ofa-Ilowance, and on the front and rear parts of the-boat are provided a 9 propeller respectively, so that by adjusting the speed of the revolution of the propellers the function of the rudders can be redoubled and consequently the course of the boat can be changed quickly and accurately. Thirdly, the stern-section of the boat is made bendable;perpendicularly at the junctionso th'at'the rear part of. the boat can be 'broughtbn ithe .beach just as it is.

, TliiS;'i11-VQI1ti0lI is explained by reference to the accompanying drawings, in which: 4 Fi ure 1 represents a side view of the en-'- tire oat... T

Figure 2 rep'resents a side view showing the jointing part of two sections. j Figure}; represents a plan view showing the jointing part of two sections.

Figure 4 represents a sideview showing/ the stem section chiefly.

0 v ure 4.

qFigure-fi represents a plan 1 view pf- Figs Figure 6 represents .a front view of the entire boat.

This invention consists in a boat (A) forming a long and narrow shape, its total weight being made a little less than, its buoyancy, and its body being built in several sectlons (1)(l) joined together in a straight.

plates being arranged to come in contact with the outer surface of either side of the end part of its successive section so that the turning angle of the joining Section, on which the two stop plates are fixed, with the joined one being restricted withina certain limit of allowance.

On the outer surface of the front part asv well as the rear part of the boat is respective ly provided a propeller (9) (11) havin blades (8') girded. by a span plate (-10), fixe on the outer surface of each of the sections I so as to reenforce the parts of the'boat where. the propellers are attached. In case of a larger "sized boat more propellers may be fixed onintermediate sections so as to counteract thefriction, resistance or like action on the. sides. The stem section is provided with a mast (2), which can be set up right.

or down when required, and at thetop of the lower mast issuspnded an observation basket (3), in which an observer may be sta' tioned on lookout, and from which a lookout kite (12) may be flown up. The boat is provided with rudders (14) (14) (141' by means of which its stability can be ensured.

- Each of the sections has a ventilator forexhaxistion as well as for air supply. However, a device may be arranged for theexhaust of the engine to vent into the water.

Thestern section is bendable perpendiculafly at the junction where it is connected with the preceding section, so that when the boat goes astern it. can get on the beach by itself, thus facilitating the connection between the boat and shore. For this purpose it is advisable to have rollers provided on the bottom of the stern section.

This invention is, as shown in Fig. 1, to construct a submersible boat which floats in a partially submergedcondition, which by operation of both front and back propellers (11) can travel through the waves at high speed, and which can be stabilized by steering the vertical and horizontal rudders, the former serving to direct the course of the boat simply and quickly and the latter serving to keep the body of the boat in vertical equilibrium. The vertical equilibrium may, however, be advantageously maintained automatically by means of a mechanical device.

When the course of the boat is to be changed the operation-of the front propeller is suspended or the speed of its revolution is reduced, the stem section being steered a little in the direction required b means of the rudder (14) so that the pro e of the stem being resisted by the water due to the inertia force of the boat goin forward it will begin to turn withingthe lim1t of allowance restrlctedby either of the stop plates (6), the succeeding sections gradually following the changed course.

The boat can be moored to an anchor buoy in an ordinary manner. It would, however, be more advantageous than otherwise to have the stern section of the boat got on the beach,

not only for facilitating the connection betweenthe boat and shore, but also for adjusting the engine by clearing the covering part of the boat. The boat has another advantage in ensuring more stability of the body,

reventing .any. oscillations by making the oat curved at the junctions when the boat is stopped.

Havin thus described the invention, what I claim is I I 1. A submersible boat which travels through the waves in a artially submerged condition, characterized 1n that it consists of a number of long, narrowand cylindrically sha ed sections, the total wei ht of which is ma e to bee little less than its uoya'ncy; that both front and back parts of the boat are provided with propellers, and vertical. and horizontal rudders, and that each of the sections is provided with a ventilator for air supply and exhaustion.

2. A submersible boat as claimed in claim -1 and further characterized in that both stem and stem ends of the boat are made sharp edged so that by slightly turning the direction of the stem section and by adjusting the speed of revolutions of the-propellers at the tain limit of allowance, the inner face of one of the stop plates coming in contact with the outer surface of the end part of the successive section. .7

5. A'submersible boat as claimed in claim 1 and further characterized in that the stern section of the boat is made to be bendable at the junction so that the back'part of the boat can be got on the beach by itself.

In testimony whereof I. have afiixed -my signature.

YASUJIRO K'INos'HI TA. 

